package siouxsie.desktop.option.impl;
   
   import java.awt.BorderLayout;
   import java.awt.CardLayout;
   import java.awt.Component;
   import java.awt.event.MouseAdapter;
   import java.awt.event.MouseEvent;
   import java.util.ArrayList;
   import java.util.Collection;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import javax.swing.JComponent;
  import javax.swing.JLabel;
  import javax.swing.JPanel;
  import javax.swing.JScrollPane;
  import javax.swing.JTree;
  import javax.swing.tree.DefaultMutableTreeNode;
  import javax.swing.tree.DefaultTreeCellRenderer;
  import javax.swing.tree.TreePath;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  
  import siouxsie.desktop.option.CategoryDescription;
  import siouxsie.desktop.option.IOptionPane;
  import siouxsie.desktop.option.IOptionPaneInitializer;
  import siouxsie.desktop.option.IPreferencesRenderer;
  import siouxsie.desktop.option.OptionPaneDescription;
  
  /**
   * JTree menu based preferences renderer.
   * @author Arnaud Cogoluegnes
   * @version $Id$
   */
  public class PreferencesRenderer implements IPreferencesRenderer {
  
  	private List<OptionPaneDescription> optionPaneDescriptions;
  	
  	private List<CategoryDescription> categoryDescriptions; 
  	
  	private IOptionPaneInitializer initializerService;
  	
  	private Collection<IOptionPane> optionPanes = new ArrayList<IOptionPane>();
  	
  	private static final Log LOG = LogFactory.getLog(PreferencesRenderer.class);
  	
  	private JPanel mainPanel;
  	
  	private JTree tree;
  	
  	/*
  	 * (non-Javadoc)
  	 * @see siouxsie.desktop.option.IPreferencesRenderer#getComponent()
  	 */
  	public JComponent getComponent() {
  		return mainPanel;
  	}
  	
  	/*
  	 * (non-Javadoc)
  	 * @see siouxsie.desktop.option.IPreferencesRenderer#save()
  	 */
  	public void save() throws Exception {
  		// TODO would need a pre-commit step?
  		for(IOptionPane pane : optionPanes) {
  			pane.save();
  		}		
  	}
  	
  	/*
  	 * (non-Javadoc)
  	 * @see siouxsie.desktop.option.IPreferencesRenderer#cancel()
  	 */
  	public void cancel() throws Exception {
  		// nothing special, could check modifications and warn
  		
  	}
  	
  	public void init() {		
  		DefaultMutableTreeNode root = new DefaultMutableTreeNode();
  		Map<String, DefaultMutableTreeNode> catIdToCat = new HashMap<String, DefaultMutableTreeNode>();
  		for(CategoryDescription cat : categoryDescriptions) {
  			DefaultMutableTreeNode node = new DefaultMutableTreeNode(cat);
  			catIdToCat.put(cat.getId(), node);
  			root.add(node);
  		}		
  		
  		// default category node, just in case
  		CategoryDescription defaultCategory = new CategoryDescription();
  		defaultCategory.setId("siouxsie_default_option_category");
  		defaultCategory.setName("Default");
  		DefaultMutableTreeNode defaultCategoryNode = new DefaultMutableTreeNode(defaultCategory);
  
  		// the option panes panel
  		final JPanel panel = new JPanel();
  		final CardLayout cardLayout = new CardLayout();
  		panel.setLayout(cardLayout);
 		
 		// empty at the beginning
 		panel.add(new JPanel(),"");
 		
 		for(OptionPaneDescription desc : optionPaneDescriptions) {	
 			
 			IOptionPane optionPane;
 			try {
 				optionPane = desc.getOptionPane() != null ? desc.getOptionPane() : (IOptionPane) desc.getClass().newInstance();
 				initializerService.initialize(optionPane);
 			} catch (InstantiationException e) {
 				LOG.error("could not create option pane",e);
 				continue;
 			} catch (IllegalAccessException e) {
 				LOG.error("could not create option pane",e);
 				continue;
 			}			
 			
 			optionPane.init();
 			
 			DefaultMutableTreeNode node = new DefaultMutableTreeNode();
 			node.setUserObject(optionPane);
 			DefaultMutableTreeNode cat = catIdToCat.get(desc.getCategoryId());
 			if(cat == null) {
 				LOG.warn("could not find preferences category "+desc.getCategoryId()+" for option pane "+optionPane.getName());
 				cat = defaultCategoryNode;
 				if(root.getIndex(cat) == -1) {
 					root.add(cat);
 				}
 				desc.setCategoryId(defaultCategory.getId());
 			}
 			cat.add(node);
 			
 			panel.add(optionPane.getComponent(),desc.getCategoryId()+"."+optionPane.getName());
 			optionPanes.add(optionPane);
 			
 		}
 		
 		tree = new JTree(root);
 		tree.setRootVisible(false);
 		tree.setShowsRootHandles(true);
 		
 		tree.setCellRenderer(new DefaultTreeCellRenderer() {			
 			@Override
 			public Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel, boolean expanded, boolean leaf, int row, boolean hasFocus) {
 				JLabel label = (JLabel) super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, row, hasFocus);
 				DefaultMutableTreeNode node = (DefaultMutableTreeNode) value;				
 				if(node.getUserObject() instanceof IOptionPane) {
 					label.setText(((IOptionPane) node.getUserObject()).getName());
 				}
 				return label;
 			}			
 		});
 		
 		mainPanel = new JPanel(new BorderLayout());
 		mainPanel.add(new JScrollPane(tree),BorderLayout.WEST);
 		mainPanel.add(panel,BorderLayout.CENTER);
 		
 		tree.addMouseListener(new MouseAdapter() {
 		     public void mousePressed(MouseEvent e) {
 		         int selRow = tree.getRowForLocation(e.getX(), e.getY());
 		         TreePath selPath = tree.getPathForLocation(e.getX(), e.getY());
 		         if(selRow != -1) {
 		        	 DefaultMutableTreeNode node = (DefaultMutableTreeNode) selPath.getLastPathComponent();
 		        	 if(node.getUserObject() instanceof IOptionPane) {
 		        		 CategoryDescription cat = (CategoryDescription)((DefaultMutableTreeNode)node.getParent()).getUserObject();
 		        		 IOptionPane pane = (IOptionPane) node.getUserObject();
 		        		 
 		        		 cardLayout.show(panel, cat.getId()+"."+pane.getName());
 		        		 
 		        	 }
 		         }
 		     }
 		 });
 		
 	}
 
 	public List<CategoryDescription> getCategoryDescriptions() {
 		return categoryDescriptions;
 	}
 
 	public void setCategoryDescriptions(
 			List<CategoryDescription> categoryDescriptions) {
 		this.categoryDescriptions = categoryDescriptions;
 	}
 
 	public IOptionPaneInitializer getInitializerService() {
 		return initializerService;
 	}
 
 	public void setInitializerService(IOptionPaneInitializer initializerService) {
 		this.initializerService = initializerService;
 	}
 
 	public List<OptionPaneDescription> getOptionPaneDescriptions() {
 		return optionPaneDescriptions;
 	}
 
 	public void setOptionPaneDescriptions(
 			List<OptionPaneDescription> optionPaneDescriptions) {
 		this.optionPaneDescriptions = optionPaneDescriptions;
 	}
 	
 	/**
 	 * For test purpose only.
 	 * @return
 	 */
 	protected JTree getTree() {
 		return tree;
 	}
 	
 }